NEW YORK, NY - AUGUST 28: Ana Ivanovic of Serbia returns a shot to Karolina Pliskova of the Czech Republic during their women's singles second round match on Day Four of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) *** BESTPIX *** ORG XMIT: 507832305 less

NEW YORK, NY - AUGUST 28: Ana Ivanovic of Serbia returns a shot to Karolina Pliskova of the Czech Republic during their women's singles second round match on Day Four of the 2014 US Open at the USTA Billie ... more

Photo: Streeter Lecka

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NEW YORK, NY - AUGUST 28: Eugenie Bouchard of Canada celebrates match point against Sorana Cirstea of Romania on Day Four of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images) ORG XMIT: 507832305 less

NEW YORK, NY - AUGUST 28: Eugenie Bouchard of Canada celebrates match point against Sorana Cirstea of Romania on Day Four of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 28, ... more

Photo: Streeter Lecka

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Bouchard has a breakthrough

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Wimbledon runner-up Eugenie Bouchard reached the U.S. Open's third round for the first time by beating 80th-ranked Sorana Cirstea of Romania 6-2, 6-7 (4), 6-4 Thursday night.

The seventh-seeded Bouchard was the only woman to reach the semifinals at the year's first three Grand Slam tournaments. She lost in that round at the Australian Open and French Open, before her run at the All England Club made her the first Canadian tennis player to reach a major final.

Bouchard made her U.S. Open debut in 2013, exiting in the second round.

To get to the fourth round this year, she will need to beat 30th-seeded Barbora Zahlavova Strycova.

If Bouchard makes it to the quarterfinals, she could face No. 3 Petra Kvitova in a rematch of the Wimbledon final.

Ana Ivanovic's comeback tour has ended with yet another early exit at the U.S. Open.

Ivanovic, who had been having her best season since winning the French Open in 2008, had 29 unforced errors in a 7-5, 6-4, second-round loss Thursday to 42nd-ranked Karolina Pliskova.

Ivanovic had won 47 matches coming into Flushing Meadows, the most of any woman on the tour this year and she returned to the top 10 for the first time in five years. Her three titles equaled the career high she set in 2008, when she reached No. 1.

She made the quarterfinals of the Australian Open, but lost early at the French Open and Wimbledon. In 10 U.S. Open appearances, she has made it as far as the quarterfinals just once.

Ivanovic joins No. 4 Agnieszka Radwanska as the highest seeds to fall in the tournament.

Top-seeded Novak Djokovic and Serena Williams both won in straight sets.

Cramp-free on a cool night, Andy Murray moved easily into the third round.

CiCi Bellis, the first 15-year-old since 1996 to win a U.S. Open match, could not follow up her victory, losing 6-3, 0-6, 6-2 to 48th-ranked Zarina Diyas.